# Relationship history for MSHA mine 1401488

Current hierarchy: **Harold  Goebel → Northern Kansas Rock Inc → NORTHERN KANSAS ROCK INC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Bohl Construction Inc → NORTHERN KANSAS ROCK INC; 1985-09-01 to 1994-08-18; source msha-controller-operator-history
- **controller_controls_mine:** James C  Bohl → NORTHERN KANSAS ROCK INC; 1985-09-01 to 1994-08-18; source msha-controller-operator-history
- **controller_controls_operator:** James C  Bohl → Bohl Construction Inc; 1985-09-01 to 1994-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Northern Kansas Rock Inc → NORTHERN KANSAS ROCK INC; 1994-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Goebel → NORTHERN KANSAS ROCK INC; 1994-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Goebel → Northern Kansas Rock Inc; 1994-08-19 to current/open; source msha-controller-operator-history